Tap-root depth of tropical seedlings in relation to species-specific edaphic preferences
Tap-root depth of tropical seedlings in relation to species-specific edaphic preferences
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热带幼苗的主根深度与物种特定土壤偏好的关系
DOI：
10.1017/s0266467404002238
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发表时间：
2005
影响因子：
1.4
通讯作者：
Sylvester Tan
中科院分区：
文献类型：
--
作者：
T. Yamada;E. Suzuki;T. Yamakura;Sylvester Tan
我们比较了马来西亚Lambir Hills国家公园热带雨林中沙土专化种(Dryobalanops aromatica和Scaphium borneense)和粘粒丰富的专化种(D.lanceolata和S.long gipeolata)的幼苗，以确定地下苗木结构和异速生长的差异是否与土壤专化性有关。在这两个属中，一个在系统发育上独立的特征是，沙土专家比粘土丰富的专家在任何高度都有更深的主根和任何根的生物量。这一特性是固定的，与树木实际生长的土壤条件无关。质地较细的土壤一般具有较好的持水能力；我们的结论是，沙质土壤的季节性水分限制比粘粒丰富的土壤更严重，水分限制会促使具有相同土壤偏好的物种在苗木根系深度上趋同。鳞毛虫种间比较的显著差异与水分可利用性假说一致；沙土专家在任何总生物量下的根生物量都大于富粘粒土壤专家，而在任何根生物量下的叶片生物量都小于粘粒丰富的土壤专家。然而，对于Scaphium来说，情况并非如此，这表明除了水分限制之外的因素也可能是苗木异速生长关系的基础。
We compared seedlings of sandy-soil specialist species (Dryobalanops aromatica and Scaphium borneense) and clay-rich-soil specialist congeners (D. lanceolata and S. longipetiolatum) in a tropical rain forest in Lambir Hills National Park, Malaysia, to determine whether variations in belowground seedling architecture and allometry were related to edaphic specialization. A convergent trait that was phylogenetically independent across the two genera was the presence of a deeper tap-root at any height and any root biomass in sandy-soil specialists than in clay-rich-soil specialists. This trait was fixed independently of the edaphic conditions in which the trees actually grew. Finer-textured soils generally have better water-holding capacity; we concluded that seasonal water limitation would be more severe in sandy soils than in clay-rich soils, and that water limitation would provoke convergence in seedling root depth among species with the same edaphic preferences. All significant differences found in interspecific comparison within Dryobalanops were consistent with the water-availability hypothesis; the sandy-soil specialist had larger root biomass at any total biomass and had smaller leaf biomass at any root biomass than the clay-rich-soil specialist. However, for Scaphium this was not the case, suggesting that factors other than water-limitation may also underlie seedling allometric relationships.
影响因子：
19.7
作者：
CASTELLINO, RA
通讯作者：
CASTELLINO, RA